Optimization of the activity of Mo7-Zn3/CaO catalyst in the transesterification of waste cooking oil into sustainable biodiesel via response surface methodology

•Mo7-Zn3/CaO catalyst was applied in FAME production.•Lewis and Brønsted base sites facilitate efficient transesterification reactions.•The reaction was optimized using response surface methodology (RSM) based on the Box Behnken Design (BBD).•A higher FAME conversion of 95–85% was maintained within...

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